What is the best expanded cement currently used

At present, the most effective expanded cement is: Portland expanded cement.

Expanded Cement Classification:

1.Portland expanded cement.

It is mainly used in the manufacture of waterproof mortar and waterproof concrete. It is suitable for reinforcing structures, pouring machine bases or consolidating anchor bolts, and can be used for joint and repair works. However, it is forbidden to use it in water projects with sulfate erosion.

2.Low-heat micro-expansion cement.

It is mainly used for concrete with low heat of hydration and requiring compensation for shrinkage, bulk concrete, and also for projects requiring impermeability and resistance to sulfate erosion.

3.Sulfoaluminate expanded cement expanded cement is mainly used for pouring component joints and in concrete engineering with impermeability and shrinkage compensation.

4.Self-stressing cement.

It is mainly used for self-stressing reinforced concrete pressure pipes and their fittings.

Expanded cement can be selected according to your use requirements:

1. Portland expanded cement; It is suitable for reinforcing structures, pouring machine bases or consolidating anchor bolts, and can be used for joint and repair works.

2. Low-heat micro-expansion cement; It is used for concrete that requires a lower heat of hydration and requires compensating shrinkage, bulk concrete, and is also suitable for projects that require impermeability and resistance to sulfate erosion.

3. Sulfoaluminate expanded cement; It is used for pouring component joints and in concrete engineering for impermeability and shrinkage compensation.

Just add water and mix it and you're ready to use.

Expanded cement is generally not mixed with other varieties of cement, and should be tested before construction to determine the reasonable expansion amount of concrete.

The preparation of expanded cement is often done by adding intumescent components to Portland cement, which will produce a suitable expansion a few days after hydration, and then compensate for the shrinkage of Portland cement concrete.

Expansion cement is also often used for the repair of concrete and for the production of prestressed concrete.

1. Add an appropriate amount of sand, gravel and water according to the requirements of different strengths to prepare the required concrete. Recommended dosage per cubic AEC expanded cement: 300-450 kg. The specific is determined by the user according to the strength of the design.

2. 2 hours after the final setting of concrete, it needs to be watered and cured, and the curing time is 7-14 days, and it is very important for this product to keep it moist in curing.

It is similar to ordinary cement, but the volume does not shrink after drying.

Is it possible to use cement and sand together with other cements to cross the sky?

Do you need to add stones to plug the joints (three to four centimeters) with swelling cement?

The expansion rate of cement is generally (10, 20), 10, 6k-1.

The coefficient of thermal expansion of concrete can be roughly expressed as a weighted average of the coefficient of expansion of cement stone and aggregate. The expansion coefficient of cement stone is about (10 20) 10 6k-1, which is larger than that of aggregate (6 12) 10 6k-1, so the expansion coefficient of concrete is about (7 14) 10 6k-1.

Cement, also known as ocean ash, red hair ash, red hair soil, etc., is a powdery hydraulic inorganic cementitious material, which will solidify and harden after mixing with water, it is usually not used alone, but is used to join with sand and gravel to form mortar or concrete.

It is not a thing, the expansion agent in the cement is usually the waterproof powder, the purpose of adding the waterproof powder is to form a waterproof mortar when the cement is mixed with the mortar, which can be used to plug the leakage and waterproof, and the concrete expansion agent is usually a chemical agent that bridges the cracks generated by the initial and final setting of the concrete or in the curing process, and eliminates the gaps through expansion, so as to achieve the effect of concrete compaction, so it is not the same thing.

In the current construction industry, burying cement is a kind of decorative building materials that we see very often, but in the process of using cement, cement expansion agent is also an indispensable raw material, which can make cement rise rapidly and surging, in order to prevent cement from condensing. Generally, it is very common in public buildings. Because many people have not been exposed to cement expander, they do not know much about its use experience, so let's explain to you whether the application effect of cement expander and shirt is good.

What is the effect of the use of cement expansion agent?

Cement expansion agent is actually a chemical admixture, which is added to cement, when the cement solidifies and hardens, it will surge with the volume, and plays a role in compensating for the prestressed steel bar caused by shrinkage and tension steel bar and its sufficient filling of cement voids. In fact, the cement cavity expansion agent is actually the use of non-metallic materials (usually alumina powder, in recent years, the application of vermicelli, alumina powder, etc.) and alkali cement to produce radon, so that the cement volume expands, to improve the compressive strength of cement, so some people call it cement styrofoam. The experience of using cement expander is still very good, and the amount of use will become very economical.

Generally, it will account for l% of the cement quality, and the following agent has been used to improve the construction quality of concrete, and then increase the strength of concrete.

What is the technical performance of cement expander

1. This product is a granule, which is non-toxic, odorless, non-flammable and does not contain chloride salts, and has no rust effect on rigid tendons.

2. This product is added to the concrete at a highly recommended intake, and there is no obvious harm to the performance of the fresh concrete.

3. With an intake of 8 10%, it can also create a micro-surge in the concrete, which can reduce the convergence of the concrete, when the minimum reinforcement ratio is, and the concrete limits its expansion coefficient to be created in the concrete, but the self-stress created in the concrete, and then can compensate for the ambient temperature convergence and drying shrinkage caused by the water-glue ratio in the initial stage of the concrete, and then can improve the impermeability grade of the concrete anti-cracking fiber performance.

5. The expansion agent has no adverse effect on the strength of concrete, but can make the thin film optics of concrete more dense, which is beneficial to improving the compressive strength of concrete in the later stage.

6. The impermeability grade of concrete mixed with appropriate expansion agent can exceed P20.

7. The expansion agent can increase the cohesiveness of concrete by 20 to 30%.

8. The expansion agent can make the corrosion resistance of concrete potassium thiocyanate and the corrosion level of the sea surface also be significantly improved.

Pro, mix the expanded cement with the right amount of water, mix evenly, and you can use it. If ordinary cement is used directly, its functionality is relatively poor, it is very easy to crack, and its durability will also be reduced. If the expanded cement is expanded, there will be no shrinkage in the process of hardening, and it will have a slight expansion effect, thus solving the cracking phenomenon caused by the shrinkage of ordinary cement.

The use of expanded cement can not only shorten the construction period required for construction, but also save a certain amount of materials, the durability and energy absorption will be better, and the waterproof and anti-cracking performance of concrete in the later stage will also increase. Therefore, in the project of many waterproof structures, expanded cement is used. However, it should be noted that expanded cement should not be mixed with other types of cement.

At the same time, before use, it is necessary to do adaptation work, so as to judge what is the reasonable expansion amount of concrete.